Before, I never really thought about it, probably would have found it a turn off or a "what?!"
Now that my wife is 220 lbs her life style has changed from being not really active to really not being active. Combined with some health issues (not weight related) she is moving around the house maybe 30-60 minutes tops. I find that a turn on. The idea that she's moving only when absolutely needed (go to the toilet, get in/out of bed) and for the rest sits or lays where I bring her her food, her drinks, her every need, is a huge turn on.
I don't need her to become physically more limited; I like and encourage her mental giving over, giving up, giving in, of "I don't want to move"
She's becoming sort of a food processor